---
title: "JM Diesel Solutions — Clean Truck Check, Greenfield, CA"
description: "JM Diesel Solutions in Greenfield, CA is on CARB's Clean Truck Check tester list. Offers mobile testing, OBD testing, motorhome testing. Phone, address and…"
url: "https://ctcfinder.com/tester/jm-diesel-solutions-greenfield/"
updated: "2026-11-01"
publisher: "CTC Finder (independent directory, not affiliated with CARB)"
---

# JM Diesel Solutions

Clean Truck Check tester in Greenfield, CA (Monterey County).

> CTC Finder is an independent directory, not affiliated with CARB. Tester data: CARB Clean Truck Check public tester list, last checked November 1, 2026. Confirm services, hours and prices with the tester.

| Field | Value |
|---|---|
| Location | 792 Cherry Ave, Greenfield, CA 93927 |
| County | Monterey County |
| Phone | (831) 585-8927 |
| Mobile testing | Yes |
| OBD testing | Yes |
| Smoke opacity (non-OBD) | No |
| Motorhomes | Yes |
| Credentialed testers | 1 |
| Last verified | 2026-11-01 |

## Which trucks JM Diesel Solutions can test

| Your vehicle | Test required | This tester |
|---|---|---|
| Diesel, model year 2013 or newer | OBD scan | Yes |
| Alternative fuel (natural gas, propane), 2018 or newer | OBD scan | Yes |
| Diesel, model year 2012 or older (no OBD) | Smoke opacity test (SAE J1667) plus visual inspection | Not listed |
| California-registered motorhome | Same test as above by engine year, once a year | Yes |

For a 2012 or older diesel, the nearest listed tester with smoke opacity testing is Express Truck and Trailer Services in Soledad, about 10 miles away. [See listing](https://ctcfinder.com/tester/express-truck-and-trailer-services-soledad/).

## Clean Truck Check testers in Monterey County

JM Diesel Solutions is one of 37 testing businesses in Monterey County on CARB's public tester list. 33 of them offer mobile testing and 11 do smoke opacity tests.

## When your truck is due

Most trucks test twice a year, on a schedule tied to the DMV registration expiration date. CARB says OBD trucks move to four tests a year beginning October 2027. California-registered (non-commercial) motorhomes and agricultural vehicles test once a year. See the [deadline guide](https://ctcfinder.com/guide/deadlines-2026-2027/). You can test up to 90 days before a deadline. Free email reminders: https://ctcfinder.com/reminders/

## Frequently asked questions

### Does JM Diesel Solutions offer mobile Clean Truck Check testing?

Yes. JM Diesel Solutions says on CARB's tester list that it offers mobile testing, so it can come to your yard or job site. Ask about a trip fee when you call.

### Can JM Diesel Solutions test a 2012 or older diesel truck?

JM Diesel Solutions does not list smoke opacity testing, which older non-OBD diesel trucks need. The nearest listed tester that does is [Express Truck and Trailer Services](https://ctcfinder.com/tester/express-truck-and-trailer-services-soledad/) (about 10 miles). Trucks from 2013 on get an OBD scan instead.

### How much does JM Diesel Solutions charge for a Clean Truck Check?

JM Diesel Solutions has not published prices with us; call (831) 585-8927 for a quote. Published California prices are usually $50–$135 per vehicle for an OBD test and $190–$200 for a smoke opacity test, plus CARB's annual fee ($32.13 in 2026). See the [cost guide](https://ctcfinder.com/guide/cost/).

### Is JM Diesel Solutions a CARB-credentialed tester?

JM Diesel Solutions appears on CARB's public Clean Truck Check tester list, last checked November 1, 2026. Only credentialed testers can submit results to CARB; after the test, confirm the passing result shows for your vehicle in CTC-VIS.

## Other testers nearby

- **[Express Truck and Trailer Services](https://ctcfinder.com/tester/express-truck-and-trailer-services-soledad/)** — 149 Nestles Rd, Soledad, CA 93960 — (831) 705-9207 — 10 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Jose Diaz](https://ctcfinder.com/tester/jose-diaz-soledad/)** — Soledad, CA 93960 — (831) 821-0165 — 10 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Premier Smogs](https://ctcfinder.com/tester/premier-smogs-soledad/)** — 801 Front St, Soledad, CA 93960 — (831) 305-3969 — 10 mi. Services: mobile testing, OBD testing, motorhome testing.
- **[Isaiah Banuelos](https://ctcfinder.com/tester/isaiah-banuelos-gonzales/)** — Gonzales, CA 93926 — (831) 261-5095 — 17 mi. Services: mobile testing, OBD testing.
- **[MH Parts and Equipment Services](https://ctcfinder.com/tester/mh-parts-and-equipment-services-gonzales/)** — 539 Delmonte Dr, Gonzales, CA 93926 — (831) 710-1878 — 17 mi. Services: mobile testing, OBD testing, smoke opacity (non-OBD) testing, motorhome testing.
- **[Salinas Valley Emissions LLC](https://ctcfinder.com/tester/salinas-valley-emissions-llc-gonzales/)** — 434 Brockmann Dr, Gonzales, CA 93926 — (831) 537-4397 — 17 mi. Services: mobile testing, OBD testing.